在C#中，将大文件加载到winform richtextbox中 [英] In C#, Loading large file into winform richtextbox

问题描述

我需要将一个10MB范围的文本文件加载到Winform RichTextBox中，但是我当前的代码冻结了UI.我尝试让后台工作人员进行加载，但这似乎也不是很好.

I need to load a - 10MB range text file into a Winform RichTextBox, but my current code is freezing up the UI. I tried making a background worker do the loading, but that doesnt seem to work too well either.

这是我尝试过的几个加载代码.有什么办法可以改善其性能?谢谢.

Here's my several loading code which I was tried. Is there any way to improve its performance? Thanks.

    private BackgroundWorker bw1;
    private string[] lines;
    Action showMethod;
    private void button1_Click(object sender, EventArgs e)
    {
        bw1 = new BackgroundWorker();
        bw1.DoWork += new DoWorkEventHandler(bw_DoWork);
        bw1.RunWorkerCompleted += bw_RunWorkerCompleted;
        string path = @"F:\DXHyperlink\Book.txt";
        if (File.Exists(path))
        {
            string readText = File.ReadAllText(path);
            lines = readText.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
            bw1.RunWorkerAsync();

        }
    }

    private void bw_DoWork(object sender, DoWorkEventArgs e)
    {
        Invoke((ThreadStart)delegate()
        {
            for (int i = 0; i < lines.Length; i++)
            {
                richEditControl1.Text += lines[i] + "\n";
            }
        });
    }

我也尝试:

Action showMethod = delegate()
            {
                for (int i = 0; i < lines.Length; i++)
            {
                richEditControl1.Text += lines[i] + "\n";
            }
            };

推荐答案

这与您如何调用UI更新有关，请检查下面的AppendText.

It's about how you're invoking the UI update, check the AppendText bellow.

private BackgroundWorker bw1;

private void button1_Click(object sender, EventArgs e)
{
    bw1 = new BackgroundWorker();
    bw1.DoWork += new DoWorkEventHandler(bw_DoWork);
    bw1.RunWorkerCompleted += bw_RunWorkerCompleted;
    bw1.RunWorkerAsync();
}

private void bw_DoWork(object sender, DoWorkEventArgs e)
{
    string path = @"F:\DXHyperlink\Book.txt";
    if (File.Exists(path))
    {
        string readText = File.ReadAllText(path);
        foreach (string line in readText.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries))
        {
            AppendText(line);
            Thread.Sleep(500);
        }
    }
}

private void AppendText(string line)
{
    if (richTextBox1.InvokeRequired)
    {
        richTextBox1.Invoke((ThreadStart)(() => AppendText(line)));
    }
    else
    {
        richTextBox1.AppendText(line + Environment.NewLine);
    }
}

除了读取整个文件的文本外，效率非常低.我宁愿逐块阅读并更新UI.即

In addition to that reading the whole file text is very inefficient. I would rather read chunk by chunk and update the UI. i.e.

private void bw_DoWork(object sender, DoWorkEventArgs e)
{
    string path = @"F:\DXHyperlink\Book.txt";
    const int chunkSize = 1024;
    using (var file = File.OpenRead(path))
    {
        var buffer = new byte[chunkSize];
        while ((file.Read(buffer, 0, buffer.Length)) > 0)
        {
            string stringData = System.Text.Encoding.UTF8.GetString(buffer);

            AppendText(string.Join(Environment.NewLine, stringData.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)));
        }
    }
}

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